Why is IPv6 being used on my SBS 2008 Network (Server and Clients)

We were investigating some random network/browsing issues from client machines and noticed that in DNS are IPv4 and IPv6 addresses in Forward Lookup Zone (nothing in reverse). In addition, when we are using PING or NSLOOKUP from client or server they are all using IPv6.
This is not what I would consider to be normal operation although there is a lot of chatter about SBS 2008 and IPv6.
I have a number of other networks where this is not the case so fear someone or something has been tinkering.

Any advice?
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FlippAsked:
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Cris HannaSr IT Support EngineerCommented:
IPv6 is configured by default in SBS 2008 and SBS 2011.  removing it will cause issues with Exchange.
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FlippAuthor Commented:
I dont plan on removing it at all, but for some reason 1 out of 5 SBS 2008 networks I find IPv6 addresses in DNS and is used when performing nslookup and ping.
I suppose above everything this network goes through random network lags so we are looking at differences between them and others - this just seemed to be to obvious to skip over.
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Cris HannaSr IT Support EngineerCommented:
If you're finding only 1 out of 5 with IPv6, then someone has been mucking about with the other ways.   There is a safe way to remove it, but it should not be the source of any issue.

My first recommendation is to run the SBS 2008 BPA http://www.microsoft.com/en-us/download/details.aspx?id=6231
Fix Everything it finds whether you think it's an issue or not

How many NICs in the server?  What brand?    RAM?    Free space on the C drive?
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FlippAuthor Commented:
Yes I suspect that previous provider played but there is no way to go back to them now.

BPA run and found nothing requiring a fix, Server has one enabled NIC and is a HP Server. The Server only has 6GB of RAM and C: is fine for space.

If you have any other suggestions then please let me know as we have a lot of network performance issues at random times we are battling for this customer.
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Cris HannaSr IT Support EngineerCommented:
The server is grossly underpowered for RAM.   At a minimum it should be double that.
Are you running version 1.5 of the BPA?
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FlippAuthor Commented:
Yes I know they are very under-spec'd, but dealing with someone who is not prepared to pay for much :(

I will have to checkout versions later this week.
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Cris HannaSr IT Support EngineerCommented:
These are clients I would dump.   They call you in because something isn't working...you tell them what it will take to get it back on track and then they don't want to pay for the fix.
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FlippAuthor Commented:
I hear you - except we have almost twisted their arm enough to replace the Server all together. I think it might be a matter of holding out another month or two :)
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Cris HannaSr IT Support EngineerCommented:
Then I would do a migration to Server Essentials 2012 R2 and O365
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FlippAuthor Commented:
I don;t like how Essentials has everything lumped in - I found that SBS although made things easy for a non-IT business but where we manage and support offsite, we have 2012 Standard down to a T these days. We install only what we need and use.

Just my 2 cents.
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Cris HannaSr IT Support EngineerCommented:
Are you aware that you can install Server 2012 R2 and simply "add the essentials role"  just like you'd add other roles to the server?  Then you get all the neat toys, with less "restrictions".
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FlippAuthor Commented:
That I did not, but not had any requirement for Essentials just yet either :)
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